Category: News

Pest of the Month July 2009 – Cassytha filiformis

Hosts: Mainly woody species including native and naturalized coastal hosts such as tree heliotrope, beach naupaka, ohia lehua, noni, and hala.  Habitat:  Primarily coastal areas, all major islands except Kaho’olawe.  Requires full sun. This species is indigenous toHawaii. Effects: Parasitic.  Infections can be fatal to host species. Treatment/prevention: (1)  Remove (prune) infected limbs as early …

Continue reading

Pest of the Month June 2009 – Naio Thrips

Hosts: Many species of Myoporum will likely be susceptible.  In Hawaii, naio thrips have been observed attacking both the prostrate (naio papa) and upright forms of the indigenous Myoporum sandwicense. Distribution: Northwestern part of the Island of Hawaii. Damage: Severe gall-like distortion of the new leaves and terminals. Stunting of terminal growth and leaf curling …

Continue reading

Pest of the Month May 2009 – Hawaiian Mistletoes

Hosts: Native hardwoods Distribution:  Varies by species – see table p. 3 of source document Management: Prune affected branches and destroy them (do not use as mulch).  Limit management to high-value forestry or landscape settings since these plants have a useful part in Hawaii‘s ecosystem. Source: Hawaiian Mistletoes (Korthalsella Species), Dr. Scot Nelson and Dr. …

Continue reading

Pest of the Month March 2009 – Red Palm Mite (Pest Alert)

Description: Red Palm Mite (RPM) is a bright red mite with long body hairs, usually with a drop of liquid at the tip of the hair. The body is flat. Range: Native to tropical and subtropical southeast Asia and the Middle East. Expanded range includes Caribbean Islands and Florida. Pathways: Extremely easy to spread. Can …

Continue reading

Pest of the Month February 2009 – Stem Bleeding of Coconut

Cause: Chalara paradoxa, a mainly soilborne plant-pathogenic fungus Hosts: Areca catechu, Barhea edulis, Caryota spp., Cocos nucifera, Elaeis guineensis, Phoenix africanus, Phoenix canariensis, Phoenix dactylifera, Raphis sp., Roystonea elata, Sabal palmetto, Sygarus romanzoffinia, Washingtonia filifera Symptoms:  black stain coming from a hole or wound and seeping down the coconut stem Management: Prevention and avoidance – don’t …

Continue reading

Pest of the Month January 2009 – Plumeria Rust

Distribution: Main Hawaiian Islands Host: Plumeria spp. Symptoms:  Powdery, yellow-orange lesions on leaves with powdery spore masses on the underside of leaves Management:  Plant resistant species or hybrids, leaf litter control/destruction, plant in drier areas, apply approved fungicides when necessary, biological control with fungal hyperparasites and an insect (midge) predator, control weeds to improve airflow, …

Continue reading

Pest of the Month November 2008 – Cycad Scale

Distribution: Oahu, Big Island, Kauai, and Maui Host:  Cycad species especially sago palm Symptoms:  Leaves turn yellow, then brown and die Management:  Biological control with tiny black lady beetle (Rhyzobius lophanthae) preferred. Source: Cycad Scale on Sago Palm, University of Hawai’i at Manoa, College of Tropical Agriculture and Human Resources, Cooperative Extension Service, Publication IP-23, October …

Continue reading

Pest of the Month October 2008 – Coconut Rhinoceros Beetle (Pest Alert)

Distribution:  South Pacific (American Samoa, others) Host:  Coconut palm, oil palms, other palm species Symptoms:  V-shaped cuts in the fronds or holes through the midrib Management:  Eliminating the places where they breed and manually destroying adults and immatures.  Also through natural enemies such as pigs, rats, ants, and some beetles and diseases (fungus Metahizium anisopliae …

Continue reading

Pest of the Month August 2008 – Sudden Oak Death (Pest Alert)

Distribution: Western U.S.–California, Oregon, Washington, British Columbia Hosts:  38 species susceptible, additional 16 species associated with disease.  Deadly to beech and oak.  Hawaiian Islands associated hosts include Camellia, Rhododendron, and Victorian laurel Symptoms:  Canker on trunk, may be oozing.  If plants showing symptoms are found, call 643-PEST from any island in Hawaii. Control:  Clear cutting, burning, …

Continue reading

Pest of the Month July 2008 – Mango Powdery Mildew

Distribution:  Widely distributed throughout the Pacific Host:  Mango Symptoms:  Whitish-gray haze on panicles, fruits, and leaves.  Killed flowers turn brown & gray. Treatment:  Plant cultivars that are less sensitive to the disease Avoid cool, humid locations and areas that receive rain during the flowering season Destroy infected fallen foliage and severely infected panicles Prune competing …

Continue reading